Final answer:
C. Wright Mills referred to the power elite at the top of his pyramid structure as the ruling class.
Step-by-step explanation:
In his book The Power Elite (1956), sociologist C. Wright Mills referred to the power elite at the top of his pyramid structure as the ruling class. Mills described them as a small group of wealthy and influential people who hold the power and resources in society. This includes wealthy executives, politicians, celebrities, and military leaders.